JP2010236288A - Construction machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a construction machine which improves the efficiency of each of pumps making up a multiple pump and makes flexible and inexpensive adjustment to an alteration of a hydraulic oil tank and a pump. <P>SOLUTION: The multiple pump 1 includes a casing 11 which has first to third pumps 12, 13, and 14 integrally incorporated therein and first and second oiling ports. The first oiling port communicates with the first and second pumps 12 and 13 via a first hydraulic oil channel formed in the casing 11, while the second oiling port communicates with the third pump 14 via a second hydraulic oil channel formed in the casing 11. A first manifold 4 for a plurality of pumps that is attached to the front end of a pump suction pipe 3 is connected to the first oiling port, while a second manifold 5 for a single pump that branches from the first manifold 4 is connected to the second oiling port. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a construction machine, and in particular, a layout of piping between a hydraulic oil tank and a multiple pump in a construction machine equipped with a multiple pump in which three or more pumps are integrally incorporated in one casing. About.

  2. Description of the Related Art Conventionally, a construction machine is known in which two pumps are integrated into one casing and a double pump provided with two oil supply ports corresponding to each pump is mounted as a main pump (for example, patents). Reference 1). In the construction machine described in Patent Document 1, a pump suction pipe connecting the hydraulic oil tank and the main pump is branched into two on the main pump side, and each branched pump suction pipe is provided in the main pump. It is the structure connected to each of two fuel filler openings.

Japanese Patent No. 2913044

  By the way, in recent years, in order to cope with the demand for higher performance and multi-function of construction machines, and to reduce the installation space of pumps and the installation cost of wiring and piping, there are three units in one casing. It has been studied to mount a multiple pump in which the above pumps are integrated into a construction machine.

  However, when the multiple pumps are mounted on the construction machine, the difference in the pipe length with respect to each pump becomes larger than when the double pump is mounted. If the pump suction pipe is connected to the pump suction pipe, the longer the pipe length, the higher the pressure loss and the lower the pump efficiency. In addition, the number of oil supply ports formed in the casing is smaller than the number of pumps integrated in the casing, and the hydraulic oil flow passage communicating with a plurality of pumps is formed in the casing. There is what I did. In this type of multiple pump, if the length of the piping for supplying hydraulic fluid to the hydraulic fluid passage communicating with the plurality of pumps is increased, the flow rate of hydraulic fluid in the piping is particularly large. Loss increases and pump efficiency decreases. Furthermore, as in the technique described in Patent Document 1, if a pump suction pipe is connected for each pump, a new pump suction pipe is required each time the layout of the hydraulic oil tank and the pump is changed. There is also a problem that it is not possible to cope with a layout change at low cost.

  The present invention has been made to solve the problems of the prior art, and the object thereof is to increase the efficiency of each pump constituting the multiple pump and to flexibly change the layout of the hydraulic oil tank and the pump. Another object of the present invention is to provide a construction machine that can cope with low costs.

  In order to achieve the above object, according to the present invention, firstly, a hydraulic oil tank and three or more pumps are integrally incorporated in one casing, and the hydraulic oil stored in the hydraulic oil tank is hydraulically operated. In the construction machine including a multiple pump that supplies the actuator, and a pump suction pipe that connects the hydraulic oil tank and the multiple pump, the multiple pump has an oil supply port provided in the casing, A first hydraulic fluid passage for supplying hydraulic oil to one of a plurality of pumps from one oil supply port into the casing, the number of which is smaller than the number of pumps integrally incorporated in the casing, and another one A first manifold for a plurality of pumps, which is formed with a second hydraulic oil passage for supplying hydraulic oil to one pump from an oil supply port, and is attached to the tip of the pump suction pipe. Is connected to an oil supply port that communicates with the first hydraulic oil flow path, and a second manifold for one pump branched from the first manifold is connected to another oil supply port that communicates with the second hydraulic oil flow path. Made the configuration.

  The number of oil supply ports provided in the casing is smaller than the number of pumps integrally incorporated in the casing, and the first hydraulic oil flow for supplying hydraulic oil from one oil supply port to a plurality of pumps inside the casing In a multiple pump in which a passage and a second hydraulic oil flow path for supplying hydraulic oil to one pump from another oil supply port are formed, piping for supplying the hydraulic oil to the second hydraulic oil path Since the flow rate in the pipe for supplying the hydraulic oil to the first hydraulic oil passage is larger than that in the inside, the pressure loss is increased. Further, in a multiple pump in which a plurality of oil supply ports are provided in the casing, the pipe length becomes longer as the pipe for supplying the hydraulic oil to the pump disposed downstream of the pump suction pipe has a larger loss. Therefore, the first manifold for a plurality of pumps attached to the tip end of the pump suction pipe is connected to the oil supply port communicating with the first hydraulic fluid passage, and the second manifold for one pump branched from the first manifold is connected to the second manifold. Since the first manifold can be arranged on the upstream side of the hydraulic oil supply path by connecting to another oil supply port communicating with the hydraulic oil flow path, the pipe for supplying the hydraulic oil to the first hydraulic oil flow path The pipe length can be shortened, and the pressure loss in the pipe can be reduced. Moreover, since it is possible to reduce the flow rate of the working oil flowing through the piping that supplies the working oil to the second working oil flow path, it is possible to reduce the pressure loss. In addition, when the first manifold for a plurality of pumps is connected to the tip of the pump suction pipe whose one end is connected to the hydraulic oil tank, and the second manifold for one pump is branched from the first manifold, Even if the layout of the multiple pumps for the hydraulic oil tank is changed, only the pump suction piping needs to be changed, and no change is required for the first and second manifolds, making it easy and low cost to change the layout. It can correspond to.

  Secondly, according to the present invention, in the first construction machine, an inner diameter of the first manifold is made larger than an inner diameter of the second manifold.

  According to such a configuration, a large amount of hydraulic oil can flow through the first manifold that supplies the hydraulic oil to a plurality of pumps. Therefore, the operation to the plurality of pumps to which the hydraulic oil is supplied via the first manifold is performed. The supply of oil becomes smooth, and the pressure loss in the pipe can be further reduced.

  In the construction machine of the present invention, a first manifold for a plurality of pumps attached to a tip end portion of a pump suction pipe is connected to an oil supply port that communicates with a first hydraulic oil passage that supplies hydraulic oil to a plurality of pumps. The second manifold for one pump branched from the first manifold is connected to another oil supply port communicating with the second hydraulic oil flow path for supplying the hydraulic oil to one pump, so that a pump is provided for each pump. The pressure loss in the first and second manifolds can be reduced as compared with the configuration in which the suction pipe is connected. Even when the layout of the multiple pumps for the hydraulic oil tank is changed, only the pump suction piping needs to be changed, and no changes are required for the first and second manifolds. It can cope with low cost.

It is a front view which shows the pump suction piping structure which concerns on 1st Example. It is a side view which shows the pump suction piping structure which concerns on 1st Example. It is a front view which shows the pump suction piping structure which concerns on 2nd Example. It is a side view which shows the pump suction piping structure which concerns on 2nd Example.

  Hereinafter, a first embodiment of a pump suction piping structure mounted on a construction machine according to the present invention will be described with reference to FIGS. The construction machine of this example is characterized in that the multiple pumps are installed in the pump setting unit of the construction machine so that the pumps constituting the multiple pumps are arranged in parallel in the horizontal direction.

  1 and 2, 1 is a multiple pump, 2 is a hydraulic oil tank, 3 is a pump suction pipe, 4 is a first manifold, and 5 is a second manifold. In the multiple pump 1 of this example, three pumps 12, 13, 14 are integrally incorporated in one casing 11, and a first oil supply port (for connecting the first manifold 4 to the casing 11) A second oil supply port (not shown) for connecting the second manifold 5 is opened. The first oil supply port is communicated with the first pump 12 and the second pump 13 via a first hydraulic oil passage (not shown) formed in the casing 11, and the second oil supply port is connected to the casing 11. Communicating with the third pump 14 through a second hydraulic oil passage (not shown).

  In the construction machine of this example, as shown in FIG. 1, the first pump 12 is disposed at the closest position from the set position of the hydraulic oil tank 2, the third pump 14 is disposed at the farthest position, and the second pump 13 is arranged at the intermediate position. Therefore, in the construction machine of this example, the first hydraulic fluid passage communicating with the first pump 12 and the second pump 13 is more hydraulic oil tank 2 than the second hydraulic fluid passage communicating with the third pump. It is arranged at a position close to the setting position.

  As the pump suction pipe 3, a flexible hose is used, and one end thereof is connected to an oil supply port (not shown) provided on the bottom surface of the hydraulic oil tank 2 through a base 31.

  The first manifold 4 passes the hydraulic oil supplied from the hydraulic oil tank 2 through the pump suction pipe 3 to the first pump 12 and the second pump 13 via the first oil supply port and the first hydraulic oil flow path. It distributes and is connected to the tip of the pump suction pipe 3. In contrast, the second manifold 5 passes the hydraulic oil supplied from the hydraulic oil tank 2 through the pump suction pipe 3 and the first manifold 4 to the second manifold 5 and the second hydraulic oil passage. These are distributed to the three pumps 14 and branched from the first manifold 4. The inner diameter of the first manifold 4 is made larger than the inner diameter of the second manifold 5. As a result, the hydraulic fluid flow rate in the first hydraulic fluid passage communicating with the first pump 12 and the second pump 13 is made larger than the hydraulic fluid flow rate in the second hydraulic fluid passage communicating with the third pump 14. be able to.

  Hereinafter, the flow of the hydraulic oil from the hydraulic oil tank 2 to each of the pumps 12, 13, and 14 will be described. The hydraulic oil O that has flowed out of the hydraulic oil tank 2 is pumped as shown by a white arrow in FIG. It flows into the first manifold 4 through the pipe 3 and branches to the first manifold 4 side and the second manifold 5 side. The hydraulic oil O that has flowed into the first manifold 4 side enters the first oil supply port, and is further branched into two flow paths in the first hydraulic oil flow path formed in the casing 11. Supplied to the second pump 13. On the other hand, the hydraulic oil O flowing into the second manifold 5 side is supplied to the third pump 14 through the second oil supply port and the second hydraulic oil passage.

  In the construction machine of this example, the flow of hydraulic oil is greater than that of the first manifold 4 that supplies hydraulic oil to the first and second pumps 12 and 13 and the second manifold 5 that supplies hydraulic oil to the third pump 14. Since it is arranged on the upstream side in the direction, the pressure loss in the first and second manifolds 4 and 5 can be reduced, and the pump efficiency of the multiple pump 1 can be improved. In addition, a first manifold 4 for a plurality of pumps is attached to the tip of a pump suction pipe 3 whose one end is connected to the hydraulic oil tank 2, and the second manifold 5 for one pump is branched from the first manifold 4. Even when the layout of the multiple pump 1 for the hydraulic oil tank 2 is changed, only the pump suction pipe 3 may be changed as necessary, and the first and second manifolds 4 and 5 need to be changed at all. Therefore, the layout can be easily changed at low cost. Furthermore, since the construction machine of this example makes the inner diameter of the first manifold 4 larger than the inner diameter of the second manifold 5, a large amount of hydraulic oil can flow through the first manifold 4, and the first and second The supply of hydraulic oil to the pumps 12 and 13 can be made smooth, and the pressure loss in the first manifold 4 can be further reduced.

  Next, a second embodiment of the pump suction piping structure mounted on the construction machine according to the present invention will be described with reference to FIGS. The construction machine of this example is characterized in that the multiple pumps are installed in the pump setting section of the construction machine so that the pumps constituting the multiple pumps are arranged in parallel in the vertical direction. In this example, the first pump 12 is disposed at the lowest position, the second pump 13 is disposed above the first pump 12, and the third pump 14 is disposed above the second pump 13. .

  In the construction machine of this example, the first manifold 4 connected to the tip of the pump suction pipe 3 is connected to a first oil filler port formed below the casing 11 and branched from the first manifold 4. The second manifold 5 is connected to a second oil supply port formed above the casing 11. Since the other parts are the same as those of the construction machine according to the first example, the corresponding parts are denoted by the same reference numerals and the description thereof is omitted.

  Also in the construction machine of this example, the flow of hydraulic oil is greater than that of the first manifold 4 that supplies hydraulic oil to the first and second pumps 12 and 13 and the second manifold 5 that supplies hydraulic oil to the third pump 14. Since it arrange | positions in the upstream of the direction, the effect similar to the construction machine which concerns on 1st Example can be exhibited.

  In each of the embodiments described above, a triple pump in which three pumps 12, 13, and 14 are integrally incorporated in one casing 11 has been described as an example. However, four or more pumps are provided in one casing 11. Even when a multiple pump in which the pump is integrally incorporated is mounted, it can be carried out in the same manner as in the above embodiments.

  The present invention can be used for a hydraulic circuit of a construction machine such as a wheel excavator.

DESCRIPTION OF SYMBOLS 1 Multiple pump 2 Hydraulic oil tank 3 Pump suction piping 4 1st manifold 5 2nd manifold 11 In casing 12 1st pump 13 2nd pump 14 3rd pump

Claims (2)

A hydraulic oil tank, a multiple pump in which three or more pumps are integrally incorporated in one casing, and the hydraulic oil stored in the hydraulic oil tank is supplied to a hydraulic actuator; the hydraulic oil tank; In a construction machine comprising a pump suction pipe connecting the multiple pumps,
In the multiple pump, the number of oil supply ports provided in the casing is smaller than the number of pumps integrated in the casing, and the pump operates from one oil supply port to a plurality of pumps inside the casing. A first hydraulic oil flow path for supplying oil and a second hydraulic oil flow path for supplying hydraulic oil from one other oil supply port to one pump;
A first manifold for a plurality of pumps attached to a tip end portion of the pump suction pipe is connected to an oil supply port communicating with the first hydraulic fluid flow path, and a second manifold for one pump branched from the first manifold is connected. A construction machine that is connected to another oil supply port that communicates with the second hydraulic oil passage.   The construction machine according to claim 1, wherein an inner diameter of the first manifold is larger than an inner diameter of the second manifold.

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